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______________________________________________________________________________

SUSE Security Announcement

Package: gpg
Announcement ID: SUSE-SA:2007:024
Date: Fri, 30 Mar 2007 13:00:00 +0000
Affected Products: SUSE LINUX 9.3
SUSE LINUX 10.0
SUSE LINUX 10.1
openSUSE 10.2
UnitedLinux 1.0
SuSE Linux Enterprise Server 8
SuSE Linux Openexchange Server 4
SuSE Linux Desktop 1.0
SuSE Linux Standard Server 8
SuSE Linux School Server
SUSE LINUX Retail Solution 8
SUSE SLES 9
Novell Linux Desktop 9
Open Enterprise Server
Novell Linux POS 9
SUSE SLED 10
SUSE SLES 10
Vulnerability Type: signature bypassing
Severity (1-10): 5
SUSE Default Package: yes
Cross-References: CVE-2007-1263

Content of This Advisory:
1) Security Vulnerability Resolved:
gpg signature bypassing
Problem Description
2) Solution or Work-Around
3) Special Instructions and Notes
4) Package Location and Checksums
5) Pending Vulnerabilities, Solutions, and Work-Arounds:
See SUSE Security Summary Report.
6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

When printing a text stream with a GPG signature it was possible
for an attacker to create a stream with "unsigned text, signed text"
where both unsigned and signed text would be shown without distinction
which one was signed and which part wasn't.

This problem is tracked by the Mitre CVE ID CVE-2007-1263.

The update introduces a new option --allow-multiple-messages to print
out such messages in the future, by default it only prints and handles
the first one.

gpg2 and various clients using GPG to check digital signatures are
affected too, but will be fixed separately.

2) Solution or Work-Around

There is no known workaround, please install the update packages.

3) Special Instructions and Notes

None.

4) Package Location and Checksums

The preferred method for installing security updates is to use the YaST
Online Update (YOU) tool. YOU detects which updates are required and
automatically performs the necessary steps to verify and install them.
Alternatively, download the update packages for your distribution manually
and verify their integrity by the methods listed in Section 6 of this
announcement. Then install the packages using the command

rpm -Fhv <file.rpm>

to apply the update, replacing <file.rpm> with the filename of the
downloaded RPM package.


x86 Platform:

openSUSE 10.2:
ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/gpg-1.4.5-24.4.i586.rpm
7e8844844d89dec746bb0f2e6faecd4f

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/i586/gpg-1.4.2-23.16.i586.rpm
0a26653f3fa65d46e4e192539c7ace01

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/gpg-1.4.2-5.14.i586.rpm
758b8a3198153d484ec09a6b1d760fb2

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/gpg-1.4.0-4.14.i586.rpm
447e593b1328e0a8c0900c525be488f5

Power PC Platform:

openSUSE 10.2:
ftp://ftp.suse.com/pub/suse/update/10.2/rpm/ppc/gpg-1.4.5-24.4.ppc.rpm
2a709e1eb6a22ace9eeba678a771ccff

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/gpg-1.4.2-23.16.ppc.rpm
0258f25101194c8ed1d39511748baef5

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/gpg-1.4.2-5.14.ppc.rpm
d8c8873e538881723d7b98cafc6402ea

x86-64 Platform:

openSUSE 10.2:
ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/gpg-1.4.5-24.4.x86_64.rpm
2535c0dd40a972c7e028ac0d60d00aeb

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/gpg-1.4.2-23.16.x86_64.rpm
88ab493766d181b2aeb85e9ba41d0f04

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/gpg-1.4.2-5.14.x86_64.rpm
c8abc6fc65e284c64f4259d8d50dd1b8

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/gpg-1.4.0-4.14.x86_64.rpm
0c5aa6ad775f5746256d7960adbeb86b

Sources:

openSUSE 10.2:
ftp://ftp.suse.com/pub/suse/update/10.2/rpm/src/gpg-1.4.5-24.4.src.rpm
3fd3ae52f6a004a24d2fd4d822a88d67

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/src/gpg-1.4.2-23.16.src.rpm
b691ff4ff478979dfe5dc1e0f6534272

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/gpg-1.4.2-5.14.src.rpm
e05305b96b232bef94eaa06249471c51

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/gpg-1.4.0-4.14.src.rpm
9bc52a7b1845bbeb23858b92696fe67b

Our maintenance customers are notified individually. The packages are
offered for installation from the maintenance web:

UnitedLinux 1.0
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

SuSE Linux Openexchange Server 4
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

Open Enterprise Server
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

Novell Linux POS 9
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

Novell Linux Desktop 9
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

SuSE Linux Enterprise Server 8
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

SuSE Linux Standard Server 8
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

SuSE Linux School Server
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

SUSE LINUX Retail Solution 8
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

SuSE Linux Desktop 1.0
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

SUSE SLES 10
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

SUSE SLED 10
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

SUSE SLES 9
http://support.novell.com/techcenter/psdb/3fafef103902137d0bea93863e650bdb.html

______________________________________________________________________________

5) Pending Vulnerabilities, Solutions, and Work-Arounds:

See SUSE Security Summary Report.
______________________________________________________________________________

6) Authenticity Verification and Additional Information

- Announcement authenticity verification:

SUSE security announcements are published via mailing lists and on Web
sites. The authenticity and integrity of a SUSE security announcement is
guaranteed by a cryptographic signature in each announcement. All SUSE
security announcements are published with a valid signature.

To verify the signature of the announcement, save it as text into a file
and run the command

gpg --verify <file>

replacing <file> with the name of the file where you saved the
announcement. The output for a valid signature looks like:

gpg: Signature made <DATE> using RSA key ID 3D25D3D9
gpg: Good signature from "SuSE Security Team <security@suse.de>"

where <DATE> is replaced by the date the document was signed.

If the security team's key is not contained in your key ring, you can
import it from the first installation CD. To import the key, use the
command

gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc

- Package authenticity verification:

SUSE update packages are available on many mirror FTP servers all over the
world. While this service is considered valuable and important to the free
and open source software community, the authenticity and the integrity of
a package needs to be verified to ensure that it has not been tampered
with.

There are two verification methods that can be used independently from
each other to prove the authenticity of a downloaded file or RPM package:

1) Using the internal gpg signatures of the rpm package
2) MD5 checksums as provided in this announcement

1) The internal rpm package signatures provide an easy way to verify the
authenticity of an RPM package. Use the command

rpm -v --checksig <file.rpm>

to verify the signature of the package, replacing <file.rpm> with the
filename of the RPM package downloaded. The package is unmodified if it
contains a valid signature from build@suse.de with the key ID 9C800ACA.

This key is automatically imported into the RPM database (on
RPMv4-based distributions) and the gpg key ring of 'root' during
installation. You can also find it on the first installation CD and at
the end of this announcement.

2) If you need an alternative means of verification, use the md5sum
command to verify the authenticity of the packages. Execute the command

md5sum <filename.rpm>

after you downloaded the file from a SUSE FTP server or its mirrors.
Then compare the resulting md5sum with the one that is listed in the
SUSE security announcement. Because the announcement containing the
checksums is cryptographically signed (by security@suse.de), the
checksums show proof of the authenticity of the package if the
signature of the announcement is valid. Note that the md5 sums
published in the SUSE Security Announcements are valid for the
respective packages only. Newer versions of these packages cannot be
verified.

- SUSE runs two security mailing lists to which any interested party may
subscribe:

opensuse-security@opensuse.org
- General Linux and SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an e-mail to
<opensuse-security+subscribe@opensuse.org>.

suse-security-announce@suse.com
- SUSE's announce-only mailing list.
Only SUSE's security announcements are sent to this list.
To subscribe, send an e-mail to
<suse-security-announce-subscribe@suse.com>.

=====================================================================
SUSE's security contact is <security@suse.com> or <security@suse.de>.
The <security@suse.de> public key is listed below.
=====================================================================
______________________________________________________________________________

The information in this advisory may be distributed or reproduced,
provided that the advisory is not modified in any way. In particular, the
clear text signature should show proof of the authenticity of the text.

SUSE Linux Products GmbH provides no warranties of any kind whatsoever
with respect to the information contained in this security advisory.

Type Bits/KeyID Date User ID
pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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